• Alan Curry's avatar
    [PATCH] framebuffer: cmap-setting return values · db77ec27
    Alan Curry authored
    A set of 3 small bugfixes, all of which are related to bogus return values
    of fb colormap-setting functions.
    First, fb_alloc_cmap returns -1 if memory allocation fails. This is a hard
    condition to reproduce since you'd have to be really low on memory, but from
    studying the contexts in which it is called, I think this function should be
    returning a negative errno, and the -1 will be seen as an EPERM. Switching it
    to -ENOMEM makes sense.
    Second, the store_cmap function which is called for writes to
    /sys/class/graphics/fb0/color_map returns 0 for success, but it should be
    returning the count of bytes written since its return value ends up in
    userspace as the result of the write() syscall.
    Third, radeonfb returns 1 instead of a negative errno when FBIOPUTCMAP is
    called with an oversized colormap.  This is seen in userspace as a return
    value of 1 from the ioctl() syscall with errno left unchanged.  A more
    useful return value would be -EINVAL.
    Signed-off-by: default avatarAlan Curry <pacman@TheWorld.com>
    Cc: "Antonino A. Daplas" <adaplas@pol.net>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>